feat(logging): 添加微秒级时间戳支持到日志格式化

引入自定义的 MicrosecondFormatter 来显示日志时间戳的微秒部分，便于更精确的日志时间追踪

src/leadlag/strategy.py

@@ -32,10 +32,20 @@ logger.setLevel(logging.INFO)
 
 # 如果logger还没有handler，添加一个
 if not logger.handlers:
-    # 创建formatter
-    formatter = logging.Formatter(
+    # 创建自定义formatter以支持微秒
+    class MicrosecondFormatter(logging.Formatter):
+        def formatTime(self, record, datefmt=None):
+            from datetime import datetime
+            ct = datetime.fromtimestamp(record.created)
+            if datefmt:
+                s = ct.strftime(datefmt)
+            else:
+                s = ct.strftime('%Y-%m-%d %H:%M:%S.%f')
+            return s
+    
+    formatter = MicrosecondFormatter(
         fmt='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
-        datefmt='%Y-%m-%d %H:%M:%S'
+        datefmt='%Y-%m-%d %H:%M:%S.%f'
     )
     
     # 添加控制台handler